Projecting means for submarine signaling apparatus



July 18, 1939. w. KUNZE PROJECTING MEANS FOR SUBMA RINE SIGNALING APPARATUS Filed June 15, 1936 E m y///////// m w E FIGI INVENTOR. I BY W/M MM 2::

2 ATTORNEY.

Patented July 18, 1939 warren stares PATENT mes PROJECTING MEANS FOR SUBMARINE SIGNALING APPARATUS Willy Kunze, Bremen, Germany, assignor to Atlas Werire Aktiengesellschaft, Bremen, Germany Application June 15, 1936, Serial No. 85,229 In Germany June 17, 1935 4 Claims. (Cl. 181-05) 5 or may be projected in the operation of the sub-- marine signaling system. L When such apparatus is projected below the skin of the vessel, considerable pressure is impressed upon it when the vessel is in motion due to 40 the water pressure built up by the moving ship. In high speed vessels this pressure is considerable and as a result the apparatus itself must be made sumciently strong so that it can properly withstand the force and shocks to'which it is at times 15 subjected. This has been accomplished by designing the apparatus with a suificiently thick wall to withstand the forces developed, but in doing so the walls, substantially interferewith the transmission of the sound waves, particularly in the higher frequencies, and interfere with the best reception. y

In .the present invention these disadvantages are overcome in that the soundapparatus is practically as free as in the open water and the sound waves are not interfered with by a body of different characteristics than the water medium before the waves reach the submarine signaling apparatus. In addition to this, the arrangement may also act to protect the receiverfrom certain undesirable extraneous sounds and in this way insure a quieter listening field than would otherwise be possible. 1

The invention will bemore clearly-understood in connection with the drawing described below in which Fig. 1 showsa side view of a hull body incorporating the features of the present invention; Fig. 2 shows a cross section on the line 11-11 of Fig. 1; Fig. 3 shows a modified cross section taken on the line 111-111 of Fig. l in increased dimensions; Fig. 4'shows a cross section on the line IVIV in accordance with a further modification on a larger scale; Figs. 5 and 6 show two different positions of the hull body; Fig. 7

a shows a verticalsectionthrough a further form of arrow indicates the direction of the ship's travel. The hull body 2 is so positioned in relation to the direction of normal motion of the vessel that the front part of the hull body is formed from thin metal, as indicated more clearly in Fig. 2, while the rear portion 6 is constructed as a solid heavy body with the stream line form as shown in Fig. 2. In'this manner it is possible to insure a rigid support between the hull-device and the ships body even at high speeds of travel of the ship.

In the section shown in Fig. 3, which may be an enlarged section of the device indicated in Fig. l,

the front part of the hull body may be made of athin metal'tube which may in anydesired manner be joined with the rear stream-lined portion 6' to furnishstrength for the structure. In order to increase thestrength of the front wall portion of the tube, ribs I may be employed which may be kept sufiiciently small so thatno interference with the receiver may be present, such, for instance, as the causing of a sound shadow due to the sound beam being picked up by the body in front of the receiving element. a

In Fig. 4 a somewhat different construction is shown than that in Figs. 2 and 3, but only to the extent of the rear thick supporting element which in the case in Fig. 4 is somewhat more-narrow than that shown in Fig. 3 and thereby permits the reception of the sound receiver over a larger angular range as indicated in Fig. 4 by the arc E.- The hull body in the present invention is so made that the soundapproaching from the aft direction of i the vessel will not eillciently reach the receiving unit and this is more of an advantage than a disadvantage because, due to the churning of the water by the propeller and the effects of water eddies due to the vessel itself, the rear of the vessel not only preventssound from passing through the.

water beneath it to the receiving unit, but also generates and produces a substantial amount of noise which is detrimental to quiet listening from other forward directions.

In the modifications indicated in Figs. 4 and 5 it is intended to use the ordinary mechanism well known in the art for hoisting and lowering the shaft 8 and it is further intended to arrange the shaft ii on which the sound receiving element It) is mounted so that it; too, may independently, if desired, be hoisted within the vessel or lowered beneath the hull body as indicated in Fig. 6. The hoisting and lowering mecha sm commonly used in this art may be employed for this purpose. In addition to this. provision may be made p withdrawn. within the hull body as indicated by ous combinations may be employed and the lisreceiver can be projected through.

the direction of the arrow I! at the point-of support I! for the receiving unit. This may'be ae-' complished in any well known manner, as for instance, in United States Patent No.. 1,719,937. It will be obvious that in this arrangement vari- I! at one side and a lighter wall H at the front 1 side, the wall I being tapered to a thin sheet such as indicated at Ii shown more clearly in Fig.

9. In'Fig. 8 the'section along the line VIII-N111 is indicated showing theshape and thickness of the front portion II and indicating also how far this wall extends to the rear.

From the'section shown in Fig. 9.it will be evident that the angle of reception of the receiver I0 embraces the large angle F and makes'it possible to listenpractically entirely around thewhole horizon except for the small section'in/ the direction of the rear of the vessel. i It may also be noted that the section in accordance'with Fig.2 shows the angle D indicating a smaller angle, of reception than those of Figs. '4 and 9. I In special cases of construction the entire' bottom of the hull body, as indicated in Fig. 7,'may be made of thin metal where the length is sufllciently short so as to provide suflicien't strength under the conditions wwhich-the apparatus may be employed. It is quite evident that various shapes of stream-lined surfaces may be employed and those in particular which will provide stream-lined ef-' fect for the'water passing over the front surface,-

'whereby the end of the receiving unit ll may be indicated in Figs. 2, 3 and 4. The underwater apparatus can, of course, be made directional and rotated about its vertical apparatus in order to.

select the direction from which the sound returns with greatest intensity and, in fact, the

device may be used for transmission, particularly the transmission of a-directivebeam, in a similar manner.

\ Havingnow described my invention, 1 claim:

1. A device for submarine signaling adapted to project from a vessel comprising a shaft having a hollow section and being streamlined with the the general shape of which, however, is that as 2. A device for submarine signaling adapted to project from a vessel comprising a hollow shaft having transverse streamlined sections. said shaft I being comparatively thick and tapered on one side and having a comparatively thin wall on the opposite side, sound-signaling means placed within the hollow section of said shaft and means filling the hollow section with a medium to allow sound to be conducted to said sound-signaling means.

3. A device for submarine signaling adapted to having transverse streamlined sections with one portion-tapered to a small end and havinga project from a vessel comprising a hollow shaft comparatively thick wall and the other portion having a thin wall,'said shaft being open at the 'cavity behind the rounded section and soundsignaling means .positioned in said cavity.

WILLY KUNZE. 

